The best moment might be a single sentence: "Locate any currents that may have carried the arm to that location in that time." It is a talky episode in the best sense: every exchange is a small duel, and nobody brought a shield. It is a side quest, the sort you would skip in a video game and feel briefly guilty about. Mitene arrives, and the room gets noticeably more complicated. Recommended, with a cup of something warm.